diff --git a/go.mod b/go.mod
index e42cf380ba4..a41c8c36cb9 100644
--- a/go.mod
+++ b/go.mod
@@ -371,4 +371,4 @@ replace xorm.io/xorm => github.com/grafana/xorm v0.8.3-0.20220614223926-2fcda756
 
 // Use our fork of the upstream alertmanagers.
 // This is required in order to get notification delivery errors from the receivers API.
-replace github.com/prometheus/alertmanager => github.com/grafana/prometheus-alertmanager v0.24.1-0.20221006171631-7f1ce00421dc
+replace github.com/prometheus/alertmanager => github.com/grafana/prometheus-alertmanager v0.24.1-0.20221012142027-823cd9150293
diff --git a/go.sum b/go.sum
index 431e0517f63..67d69683ed2 100644
--- a/go.sum
+++ b/go.sum
@@ -1374,12 +1374,10 @@ github.com/grafana/grafana-google-sdk-go v0.0.0-20211104130251-b190293eaf58/go.m
 github.com/grafana/grafana-plugin-sdk-go v0.114.0/go.mod h1:D7x3ah+1d4phNXpbnOaxa/osSaZlwh9/ZUnGGzegRbk=
 github.com/grafana/grafana-plugin-sdk-go v0.139.0 h1:2RQKM2QpSaWTtaGN6sK+R7LO7zykOeTYF0QkAMA7JsI=
 github.com/grafana/grafana-plugin-sdk-go v0.139.0/go.mod h1:Y+Ps2sesZ62AyCnX+hzrYnyDQYe/ZZl+A8yKLOBm12c=
-github.com/grafana/prometheus-alertmanager v0.24.1-0.20221006171631-7f1ce00421dc h1:FFso22Qq3ULTBiFRnbkqmf8UbUhnPALK5ebns1EQ278=
-github.com/grafana/prometheus-alertmanager v0.24.1-0.20221006171631-7f1ce00421dc/go.mod h1:HVHqK+BVPa/tmL8EMhLCCrPt2a1GdJpEyxr5hgur2UI=
+github.com/grafana/prometheus-alertmanager v0.24.1-0.20221012142027-823cd9150293 h1:dJIdfHqu+XjKz+w9zXLqXKPdp6Jjx/UPSOwdeSfWdeQ=
+github.com/grafana/prometheus-alertmanager v0.24.1-0.20221012142027-823cd9150293/go.mod h1:HVHqK+BVPa/tmL8EMhLCCrPt2a1GdJpEyxr5hgur2UI=
 github.com/grafana/saml v0.4.9-0.20220727151557-61cd9c9353fc h1:1PY8n+rXuBNr3r1JQhoytWDCpc+pq+BibxV0SZv+Cr4=
 github.com/grafana/saml v0.4.9-0.20220727151557-61cd9c9353fc/go.mod h1:9Zh6dWPtB3MSzTRt8fIFH60Z351QQ+s7hCU3J/tTlA4=
-github.com/grafana/thema v0.0.0-20220817114012-ebeee841c104 h1:dYpwFYIChrMfpq3wDa/ZBxAbUGSW5NYmYBeSezhaoao=
-github.com/grafana/thema v0.0.0-20220817114012-ebeee841c104/go.mod h1:fCV1rqv6XRQg2GfIQ7pU9zdxd5fLRcEBCnrDVwlK+ZY=
 github.com/grafana/thema v0.0.0-20220929145912-2c7c4a7bb20b h1:OEGzlaj04LE6Eq7aGMOh0bCplGW5rXNeSSSwgamPBEY=
 github.com/grafana/thema v0.0.0-20220929145912-2c7c4a7bb20b/go.mod h1:i3/NX50sNrwsPSAQAj56ckjQTb4biaYG/6y+zyKgpb0=
 github.com/grafana/xorm v0.8.3-0.20220614223926-2fcda7565af6 h1:I9dh1MXGX0wGyxdV/Sl7+ugnki4Dfsy8lv2s5Yf887o=
diff --git a/pkg/tests/api/alerting/api_notification_channel_test.go b/pkg/tests/api/alerting/api_notification_channel_test.go
index e31bd6884d0..b06d781c5e4 100644
--- a/pkg/tests/api/alerting/api_notification_channel_test.go
+++ b/pkg/tests/api/alerting/api_notification_channel_test.go
@@ -857,8 +857,8 @@ func TestNotificationChannels(t *testing.T) {
 
 					// If the receiver is not active, no attempts to send notifications should be registered.
 					if expActive {
+						// Prometheus' durations get rounded down, so we might end up with "0s" if we have values smaller than 1ms.
 						require.NotZero(t, integration.LastNotifyAttempt)
-						require.NotEqual(t, "0s", integration.LastNotifyAttemptDuration)
 					} else {
 						require.Zero(t, integration.LastNotifyAttempt)
 						require.Equal(t, "0s", integration.LastNotifyAttemptDuration)
diff --git a/public/app/features/alerting/unified/components/receivers/ReceiversTable.tsx b/public/app/features/alerting/unified/components/receivers/ReceiversTable.tsx
index 339561b2519..becfd6e8bb9 100644
--- a/public/app/features/alerting/unified/components/receivers/ReceiversTable.tsx
+++ b/public/app/features/alerting/unified/components/receivers/ReceiversTable.tsx
@@ -202,8 +202,8 @@ function NotifiersTable({ notifiersState }: NotifiersTableProps) {
       {
         id: 'lastNotifyDuration',
         label: 'Last duration',
-        renderCell: ({ data: { lastNotifyDuration } }) => (
-          <>{durationIsNull(lastNotifyDuration) ? '-' : lastNotifyDuration}</>
+        renderCell: ({ data: { lastNotify, lastNotifyDuration } }) => (
+          <>{isLastNotifyNullDate(lastNotify) && durationIsNull(lastNotifyDuration) ? '-' : lastNotifyDuration}</>
         ),
         size: 1,
       },